Fly exterminator



June 3, 1941. H. L. EVANS 2,244,191

ELY EXTERMINAJIOR Filed Jun 5, 1940 2Sheets-Sheet 1 In ventor HENR Y Z UTHER .FVA N5 E By A iiorne y June 3 1941. H. L. EVANS 2,244,191

' FLY EXTERMINATOR Filed June 5, 19 40 2 Sheets-Sheet 2 In ventor i HEN/Q) Z UTHER EVA N5,

By I? w A itomey Patenteol June 3, 1941 psi-reo- STATES PATENT o'F-rrce FLYv EX'fljijZiNATOR Henry Luther Evans, Kress, Tx., assignor of onehalf to H. A. Buhrkuhl, 'Kress, Tex.

Application June 5, 1940, Serial No. 339,024

1 Claim.

My invention relates to improvements in fly exterminators and the principal object in view is to provide a simply constructed, highly efiicient device of this character for electrocuting flies and which will operate on a low voltage current.

Other and subordinate objects, together with the precise nature of my improvement, will be readily understood when the succeeding description and claim are read withreference to the drawings accompanying and forming part of this specification.

In said drawings:

Figure 1 is a view in front elevation, partly diagrammatic, of the preferred embodiment of my invention,

Figure 2 is a View in transverse section taken on the line 2-2 of Figure l, partly broken away and drawn to an enlarged scale, and

Figure 3 is a diagrammatic view illustrating the wiring.

Referring to the drawings by numerals, in the preferred embodiment thereof my improved exterminator comprises, as its basic element, a rectangular frame I of any suitable material, internally channeled and including top and bottom bars 2, 3, and end bars 4, all preferably integral. A pair of suitable hooks 5 are provided on the top bar 2 for suspending the frame from the top edge of a screen, screen door, or any other suitable place, for instance, a Wall. A trough 6 extends along the bottom bar 3 at what constitutes the front side of the frame I and for a purpose presently seen.

Fitted in the frame I and suitably secured therein, as by bolts I, is a rectangular grid supporting frame 8 of insulation material, preferably of T-iron form in cross-section, and provided on the front face thereof with insulator studs 9 spaced vertically along the sides of the same as best shown in Figure 1.

The frame 8 supports a grid Iii of wires extending from side to side thereof in parallel equidistantly spaced relation. The grid I0 is formed of two lengths of wire, of suitable conductive material, each looped back and forth across the frame 8 over studs 9 to form two separate series II, I2, of parallel wire stretches, the stretches of each series alternating with those of the other, and the spacing of the stretches being such that an electric current of high voltage which the device is designed to utilize will not jump from one stretch to another, but will jump through the body of a fly travelling on one stretch to an ad-' jacent stretch. The series II of wire stretches may be formed with suitable comprises one side of the grid and the series I2 the other side.

The described series of wire stretches II and I2 are designed to be energized primarily from a suitable low voltage electrical source, for instance, the battery I3, and through the medium or" a time controlled circuit maker and breaker I l and a vibratory ignition coil I5.

The circuit maker and breaker I4 comprises a clock with the usual second hand I6 operating a contact arm I'I fast on the arbor thereof to wipe at quarter minute intervals over contacts I8 arranged in said clock in degree angular relation around the dial I9 thereof. Contacts 20 similar to contacts I8 are provided for controlling another exterminator and which need merely be mentioned in passing. A lead wire 2| connects the positive side of battery I3 to the arbor of the second hand I6, with a suitable control switch 22 interposed therein. Branch leads 23 extend from the contacts I8. A lead 24 connects the branch leads 23 to the primary tap 25 of the ignition coil 26 which is of the usual type having a secondary terminal tap 21 common to the primary and secondary windings 28, 29, and another secondary terminal tap 39 for the secondary winding 29. A lead 3| connects the tap 27 to the series I I of wire stretches and a lead 32 connects the tap 30 to the series I2, said leads 3|, 32, forming extensions of said series respectively. Lead 3i is connected to the negative side of the battery I3 by a return wire 34 intermediate tap 25 and the stretches of series II. The leads 3I, 32, plug-in terminals 35, 36, for connection to the frame I and series I I, I2.

The operation of my invention will be readily understood. With the described frame I, and grid I I] hung on a screen, or the like, not shown, the clock suitably hung on a wall, for instance, and the leads 3], 32, suitably connected, the switch 22 is closed, thereby conditioning the device for operation. Each time the contact I 7 engages a contact I8, the device is conditioned for closing of a circuit from battery I3 through lead 2I, switch 22, hand ll, branch lead 23 from the engaged contact I8, lead 24, primary coil 28, and lead 3I, and return line 34 back to battery I3. In the meantime a fly lighting on stretches I l, or I2 causes a high tension circuit, induced through secondary coil 29, to be closed, the current flowing through coil 29, lead 32, the stretch I2 concerned and jumping to the stretch II concerned to return by way of lead 3I back to coil 29. As will be understood, the high tension cir- 2 cuit is of the proper voltage to kill the fly which drops into the trough 6.

The foregoing will, it is believed, suffice to impart a clear understanding of my invention without further explanation.

Manifestly the invention as described, is susceptible of modification Without departing from the inventive concept, and right is herein reserved to such modifications as fall within the scope of the subj oined claim.

What I claim is:

In a fly exterminator, a rectangular frame adapted to be suspended from a fixed object, an electric circuit including two series of wire stretches extending across said frame in parallel relation and with the stretches of said series alternating in spaced relation for bridging of the current from stretches of one series to those of the other series through the body of a fly lighting on the stretches of either series, said frame comprising a pair of outer and inner frame members of insulation and conductive material, respectively, the outer frame being internally channeled and the inner frame having a flat rim fitting against the bottom of said channel and an inwardly projecting flange on said rim centered in said channel and spaced from the sides thereof, said flange having laterally extending studs thereon within said channel around which the series of wire stretches are looped whereby said stretches are housed and insulated from the outer frame member to obviate contact there'- with by individuals handling the frame.

HENRY LUTHER EVANS. 

